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Questions tagged [soi]

Questions regarding the region around a celestial body where it is the primary gravitational influence on orbiting objects.

45
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3answers
13k views

Has any human ever had the choice to leave Earth permanently?

Far beneath the ship / The world is mourning They don't realize / He's alive No one understands But Major Tom sees / "Now the light commands This is my home / I'm coming home." Peter ...
3
votes
1answer
131 views

From which direction should a spacecraft intercept a target planet's sphere of influence for an inner-to-outer planet trajectory?

Suppose a spacecraft is on an interplanetary Hohmann transfer trajectory from an inner planet to an outer planet. When the spacecraft finally enters the target planet's sphere of influence, which ...
2
votes
2answers
200 views

How can I find the time of flight between spheres of influence?

I'm simulating an interplanetary trajectory between two spheres of influence. I have already simulated a hyperbolic escape within the sphere of influence and have arrived at the boundary of the ...
0
votes
2answers
1k views

How to calculate the sphere of influence radius of the sun and other stars?

I am creating a space exploration game and I'm gathering formulas for determining how the player's spacecraft will act in space. One thing I need to know is how to calculate how far a spacecraft can ...
5
votes
2answers
600 views

If there was a probe orbiting at the edge of Earth's Sphere of influence, how slow would it orbit?

Would it orbit very slowly? It's kinda been stuck in my head lately...
10
votes
1answer
1k views

Mars Orbit Upon Intercept

I'm running a numerical simulation that calculates an interplanetary trajectory from Earth to Mars, and I'm trying to get a spacecraft into an orbit about Mars upon intercept, but am having a little ...
4
votes
3answers
528 views

How do orbital elements change when force is applied orthogonal to the velocity vector?

Let's say you are standing on the Moon, with the Earth directly above your head (the moon being tidally locked with the earth. At this point you and the Moon are sharing an orbit, both experiencing ...
11
votes
1answer
661 views

Why is the SOI of Jupiter less than that of Neptune?

Recently we had a question on gravitational SOI (Sphere of Influence) of planets but the image in answer has a plot showing that the SOI of Jupiter is less than that of Neptune. However, Jupiter's ...
24
votes
3answers
9k views

How large is the Earth's gravitational Sphere of Influence and how can it be calculated?

There was a recent update on ISRO's Mars Orbiter Mission's (MOM) Facebook page that it has crossed the Earth's Sphere of Influence (SOI): MOM moves on! MOM is going to cruise out of the sphere ...